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importre# Enter your code here. Read input from STDIN. Print output to STDOUTtest_cases=int(input())fornuminrange(test_cases):case=input()valid_card_pattern=re.compile(r'^(?!.*(\d)(-*\1){3,})([4-6][0-9]{3}-?([0-9]{4}-?){3})$')ifvalid_card_pattern.match(case):print('Valid')else:print('Invalid')
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Validating Credit Card Numbers
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